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Well, you're question is actually a bit complicated. The direct answer would be:
Trigger = ...;
Buy = Trigger AND Close > ValueWhen(Trigger, Close, 2);
The above assumes that you wanted to buy on the trigger bar and that you would know immediately that that bar was in fact a trigger. We use a lookback of 2 since 1 would map to the current bar (which is also a trigger bar).
Where it gets complicated is that in your example you mentioned pivot low. You can never know whether a bar was a pivot low until one or more bars into the future. Therefore, you must alter the code to make the trigger be the point at which you can actually recognize the pivot low as being such (i.e. the bar one or more bars in the future from the actual pivot low at which point you are able to look back and say "yes, that was the pivot low"). See AFL Library for examples http://www.amibroker.com/library/detail.php?id=353
That being the case, you must use ValueWhen for both the Close of the current pivot low and of the one preceding it:
PivotLow = ...;
Trigger = ...;
Buy = Trigger AND ValueWhen(PivotLow, Close, 1) > ValueWhen(PivotLow, Close, 2);
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "shahariar4" <shahariar4@xxx> wrote:
>
> Hi MIke:
>
> Thanks for your correction. my basic idea is to suppose i have a buy signal; that buy signal's bar has to be of higher value that the last bar where anothe rbuy signal occured.
>
>
> suppose for example i want to buy on pivot low signal,but i want to add a codnition to it that if this pivot is of higer value than the last pivot low that occured;
>
>
> this way i would know if the stock is in short trend or not...as tredning stocks should create higer pivotlows in itsd way up....
>
> so, i want to refence the last pivotlow
>
> like we refer last clsoing pice as C>ref(c,-1) how it could be done for pivotlow Pivotlow>last pivotlow....
>
> Any idea would be aprreciated and thanks in advance for you help.
>
> Regards,
>
> Shahariar
> --- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@> wrote:
> >
> > Your logic is flawed. Cond3 can never be true.
> >
> > Note that Cross returns 1 or 0. So, there are 3 possible scenarios for any two sequential Cond1 values x,y where x is the previous bar value and y is the current bar value:
> >
> > 0, 0 zero followed by a zero (no recent cross)
> > 0, 1 zero followed by a one (cross = true on current bar)
> > 1, 0 one followed by a zero (cross = true on previous bar)
> > 1, 1 (not possible since cross cannot happen twice in a row)
> >
> > Now look at your Ref statement, Ref(Cond1, Cond1 - 1), for each scenario:
> >
> > 0, 0 -> Ref(Cond1, 0 - 1) gives previous bar value of 0
> > 0, 1 -> Ref(Cond1, 1 - 1) gives current bar value of 1
> > 1, 0 -> Ref(Cond1, 0 - 1) gives previous bar value of 1
> >
> > And your final logic of Cond1 > Ref(Cond1, Cond1 - 1)
> >
> > 0, 0 -> 0 : 0 not greater than 0
> > 0, 1 -> 1 : 1 not greater than 1
> > 1, 0 -> 1 : 0 not greater than 1
> >
> >
> > Mike
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "shahariar4" <shahariar4@> wrote:
> > >
> > > Hi, All Memebrs,
> > >
> > > Some little help in needed for the following idea.
> > >
> > > I have tried a code as follows but it does not show any result or arrow...what am i making wrong?
> > >
> > > Buy= when cond1 occurs and this cond1 has to be of higer value than the last cond1
> > >
> > >
> > > Cond1=Cross( ZLTyp, ZLHa );
> > > Cond2=Cross( ZLHa, ZLTyp );
> > > Cond3= Cond1> Ref(Cond1,Cond1 -1);
> > >
> > >
> > > Buy=IsTrue(Cond1 AND Cond3);
> > >
> > >
> > > // Suppose i am using a pivotlow as my buy signal, if the pivotlow my scan ditercts during scan, that pivotlow has to be at higer position than the previous pivotlow; so as like finding an uptrend with pivots........
> > >
> >
>
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